[lwip-devel] [task #10139] Prefer statically allocated memory

[Simon Goldschmidt]

Follow-up Comment #1, task #10139 (project lwip):

This is the last call for objections before I change semaphore and mbox
functions to take pointers and the _new() functions returning err_t instead of
sys_sem/mbox_t:

err_t sys_sem_new(sys_sem_t *sem, u8_t count);
void sys_sem_signal(sys_sem_t *sem);
u32_t sys_arch_sem_wait(sys_sem_t *sem, u32_t timeout);
void sys_sem_free(sys_sem_t *sem);

err_t sys_mbox_new(sys_mbox_t *mbox, int size);
void sys_mbox_post(sys_mbox_t *mbox, void *msg);
err_t sys_mbox_trypost(sys_mbox_t *mbox, void *msg);
u32_t sys_arch_mbox_fetch(sys_mbox_t *mbox, void **msg, u32_t timeout);

This essentially allows allocating semaphores/mboxes statically or even on
the stack. It breaks ports but is *much* more targeted on embedded OSes than
the current implementation.

And if I'm not mistaken, this idea is supported by one (more or less) active
developer (besides me) already (see
https://savannah.nongnu.org/task/?7212#comment4).

I'll do the change this week (hopefully some tim tomorrow) if noone objects.

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